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Radeon HD 3650 vs Radeon HD 4650 1GB

Intro

The Radeon HD 3650 features core clock speeds of 725 MHz on the GPU, and 800 MHz on the 1024 MB of GDDR4 RAM. It features 120(24x5) SPUs along with 8 Texture Address Units and 4 Rasterization Operator Units.

Compare those specifications to the Radeon HD 4650 1GB, which uses a 55 nm design. AMD has clocked the core speed at 600 MHz. The GDDR3 RAM works at a frequency of 700 MHz on this particular card. It features 320(64x5) SPUs as well as 32 TAUs and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB 55 Watts
Radeon HD 3650 78 Watts
Difference: 23 Watts (42%)

Memory Bandwidth

As far as performance goes, the Radeon HD 3650 should in theory be a bit better than the Radeon HD 4650 1GB in general. (explain)

Radeon HD 3650 25600 MB/sec
Radeon HD 4650 1GB 22400 MB/sec
Difference: 3200 (14%)

Texel Rate

The Radeon HD 4650 1GB is quite a bit (approximately 231%) more effective at anisotropic filtering than the Radeon HD 3650. (explain)

Radeon HD 4650 1GB 19200 Mtexels/sec
Radeon HD 3650 5800 Mtexels/sec
Difference: 13400 (231%)

Pixel Rate

The Radeon HD 4650 1GB should be quite a bit (approximately 66%) better at anti-aliasing than the Radeon HD 3650, and also will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 4650 1GB 4800 Mpixels/sec
Radeon HD 3650 2900 Mpixels/sec
Difference: 1900 (66%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

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Radeon HD 3650

Amazon.com

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Radeon HD 4650 1GB

Amazon.com

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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon HD 3650 Radeon HD 4650 1GB
Manufacturer AMD AMD
Year 2008 Sep 10, 2008
Code Name RV635 PRO RV730 PRO
Memory 1024 MB 1024 MB
Core Speed 725 MHz 600 MHz
Memory Speed 1600 MHz 1400 MHz
Power (Max TDP) 78 watts 55 watts
Bandwidth 25600 MB/sec 22400 MB/sec
Texel Rate 5800 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 2900 Mpixels/sec 4800 Mpixels/sec
Unified Shaders 120(24x5) 320(64x5)
Texture Mapping Units 8 32
Render Output Units 4 8
Bus Type GDDR4 GDDR3
Bus Width 128-bit 128-bit
Fab Process 55 nm 55 nm
Transistors (Unknown) million 514 million
Bus PCIe 2.0 x16/AGP 8x PCIe 2.0 x16, AGP 8x
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of MB per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon HD 3650

Amazon.com

Check prices at:

Radeon HD 4650 1GB

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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